# pi.py
from random import random
from math import sqrt
from time import clock
DARTS = int(input("输入样点个数："))
hits = 0
clock()
for i in range(1,DARTS):
    x,y=random(),random()
    dist = sqrt(x**2 + y**2)
    if dist<=1.0:
        hits = hits +1
pi = 4 * (hits/DARTS)
print ("Pi的值是 %s" % pi)
print ("程序运行时间是 %-5.5ss" % clock())
input ('\n-----------------------------\n按回车键结束')